Perhaps I did misinterpret the difference in the look. I do not have the P.S.S. s at hand, but I attach a detail wherein you can see the different look. I hope you get the impression.
The lower one is a bright deep black/blued variant (which I also have seen with protection laquer), the upper one is the one I did assume the scabbard to be phospated. It�s more grey-blue variant with slightly rougher surface.
For sure no rust remover used.

scabbards.JPG (27.3 KB, 129 downloads)

wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.